Introduce lock screen app context to extension features

extensions/browser/process_map.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_PROCESS_MAP_H_
 #define EXTENSIONS_BROWSER_PROCESS_MAP_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 98 matching lines @@
   // downgraded) or in a web page's process (privilege level needs to be
   // upgraded).
   //
   // The latter of these is slightly problematic from a security perspective;
   // if a web page renderer gets owned it could try to pretend it's an
   // extension and get access to some unprivileged APIs. Luckly, when OOP
   // iframes lauch, it won't be an issue.
   //
   // Anyhow, the expected behaviour is:
   //   - For hosted app processes, this will be blessed_web_page.
+  //   - For processes of platform apps running on lock screen, this will be
+  //     lock_screen_extension.
   //   - For other extension processes, this will be blessed_extension.
   //   - For WebUI processes, this will be a webui.
   //   - For any other extension we have the choice of unblessed_extension or
   //     content_script. Since content scripts are more common, guess that.
   //     We *could* in theory track which web processes have extension frames
   //     in them, and those would be unblessed_extension, but we don't at the
   //     moment, and once OOP iframes exist then there won't even be such a
   //     thing as an unblessed_extension context.
   //   - For anything else, web_page.
   Feature::Context GetMostLikelyContextType(const Extension* extension,
                                             int process_id) const;
 
+  void set_is_lock_screen_context(bool is_lock_screen_context) {
+    is_lock_screen_context_ = is_lock_screen_context;
+  }
+
  private:
   struct Item;
 
   typedef std::set<Item> ItemSet;
   ItemSet items_;
 
+  // Whether the process map belongs to the browser context used on Chrome OS
+  // lock screen.
+  bool is_lock_screen_context_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(ProcessMap);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_PROCESS_MAP_H_